Most of the power of Flash comes from its ability to create and manipulate symbols. A symbol is a master object that resides in one place—a panel called the Library—but can generate multiple copies of itself that can be used anywhere in Flash. Symbols offer a variety of advantages, including:
• Economy. If you have a visible object that’s intended to appear more than once in a Flash movie, you can convert it to a symbol. You can then place any number of instances (copies) of that symbol on the stage without any significant increase in the movie’s file size.
• Adaptability. Whenever you make a change in a symbol, that change is instantly reflected in all instances of the symbol.
• Flexibility. ...